Statistics You Can See, Touch, and Understand
The friendly stats course where every idea is a toy you can play with. No intimidating walls of formulas — just drag, poke, and watch it finally click. Go on, try it right now:
9 courses · 95 interactive lessons · free forever, no sign-up
Nine courses in two tracks: the Statistics Core teaches the analysis, the Research Toolkit covers everything around it. Click any topic to open its interactive lesson.
The Statistics Toolbox
Choosers, calculators, cheat sheets, datasets, flashcards, guides, and the quiz: everything that works alongside the lessons. Free, in your browser, no sign-up.
About the instructor
Hi, I'm Dr. Hakan Karsilar, a scientist and lecturer at University College Groningen, University of Groningen. I built this site because I believe statistics doesn't have to be intimidating. With the right visualizations and a bit of hands-on practice, anyone can build real intuition for how data works.
Every section is designed from the ground up: no hand-waving, no "just trust the formula." You'll see each concept in action, work through real examples, and test yourself along the way. If you're curious about the research behind the teaching, my publications are on Google Scholar.
Accessibility
StatsCapybara aims to meet WCAG 2.1 AA. Every page is keyboard-operable (there's a skip link, visible focus rings, and a focus-trapped search), text meets 4.5:1 contrast in both light and dark themes, form controls and charts are labeled for screen readers, live readouts announce as you move a slider, and the site honors your system's reduce motion setting.
The interactive visualizations are canvas graphics, so they lean on sight by nature, but each pairs its picture with text readouts, and the controls that drive it (sliders, buttons, and arrow-key nudges on the drag-based ones) work without a mouse. If something is hard to use with a keyboard or screen reader, please tell me. Accessibility is an ongoing effort, not a finished checkbox.
📴 Works offline once visited. Open a lesson on wifi and it stays readable on the train — no signal needed. You can even add StatsCapybara to your home screen.